MAPPED: The attack happened in the southeast of the city (Pic: GOOGLE MAPS)

They were pronounced dead at the scene, Acevedo said.

He went on to say a fifth police officer suffered a knee injury during the gun battle.

After the shooting, Houston Mayor Sylvester Turner tweeted: "I am waiting to get a status report.

"I am asking for your prayers for them."

The shooting happened late on Monday afternoon in the 7800blockof Harding in the southeast of the city.

Police were first called after a neighbour called to say the residents were dealing black tar heroin out of their home.

EMERGENCY: At least one of the police officers is reported to have been airlifted to hospital (Pic: KPRC)

STANDOFF: One of the three gunmen is believed to still be in the house (Pic: CBS EVENING NEWS)

In a statement, Texas Governor Greg Abbott said: "This evening's horrific attack on police officers is a solemn reminder of the service and sacrifice our brave men and women in law enforcement make every day to keep us safe.

"The city of Houston and the Houston Police Department will have whatever state resources they need to bring swift justice to those involved."